CN110745035A - Arc extinguishing device for insulated joint of steel rail of vehicle section - Google Patents
Arc extinguishing device for insulated joint of steel rail of vehicle section Download PDFInfo
- Publication number
- CN110745035A CN110745035A CN201911034068.0A CN201911034068A CN110745035A CN 110745035 A CN110745035 A CN 110745035A CN 201911034068 A CN201911034068 A CN 201911034068A CN 110745035 A CN110745035 A CN 110745035A
- Authority
- CN
- China
- Prior art keywords
- resistor
- circuit
- diode
- operational amplifier
- grounded
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 9
- 239000010959 steel Substances 0.000 title claims abstract description 9
- 230000001105 regulatory effect Effects 0.000 claims abstract description 37
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 25
- 230000008033 biological extinction Effects 0.000 claims abstract description 19
- 238000009413 insulation Methods 0.000 claims abstract description 7
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 5
- 239000010703 silicon Substances 0.000 claims abstract description 5
- 230000005669 field effect Effects 0.000 claims description 18
- 239000003990 capacitor Substances 0.000 claims description 13
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 2
- 230000035484 reaction time Effects 0.000 abstract description 2
- 230000035945 sensitivity Effects 0.000 abstract description 2
- 230000001960 triggered effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 7
- 238000001514 detection method Methods 0.000 description 6
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M5/00—Arrangements along running rails or at joints thereof for current conduction or insulation, e.g. safety devices for reducing earth currents
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Amplifiers (AREA)
Abstract
A vehicle section steel rail insulation knot arc extinction device comprises a first adjusting circuit, a second adjusting circuit, a self-oscillation trigger circuit, a third adjusting circuit, a fourth adjusting circuit, a bidirectional conduction loop and a switch S, wherein the self-oscillation trigger circuit comprises a comparison circuit and an NE555 timer; the +12V power supply outputs an adjustable reference voltage signal Vref through the first regulating circuit, bipolar voltage signals at two ends of the switch S output a unipolar direct current signal Vo through the second regulating circuit, the reference voltage signal Vref and the unipolar direct current signal Vo are input to the self-oscillation triggering circuit, the bipolar voltage signals are respectively input to the bidirectional conduction loop through the third regulating circuit and the fourth regulating circuit after being processed by the self-oscillation triggering circuit, the bidirectional conduction loop is triggered to work, and the bidirectional conduction loop is connected with the switch S in parallel. The invention can shorten the reaction time of the arc extinction device, and has low misjudgment rate; the bidirectional conduction function is realized by adopting the positive and negative parallel connection of the controllable silicon, so that the input voltage range is larger, the sensitivity effect is better, and the size is small.
Description
Technical Field
The invention relates to the technical field of arc extinction, in particular to an arc extinction device for a steel rail insulation knot of a vehicle section.
Background
The existing urban rail arc extinction device is mainly characterized in that a single-phase conduction device is additionally arranged between rails at two ends, and when a train passes through the rail from a specified direction, the device is conducted, and a loop is formed between two sections of rails, so that arc extinction is realized. And in the other method, a detection device is additionally arranged on the track, and the on-off of the single-phase conduction device is determined through logic judgment according to the voltage when the train passes through the detection device. Currently, these devices suffer from the following drawbacks; firstly, the adopted devices are all single-phase conduction devices, and current can only flow through one side; and secondly, the detection device has time delay, so that misjudgment is easily caused, and the arc extinction device cannot be conducted in time. In addition, the arc extinguishing device provided with the detection device has a large volume, a certain installation space needs to be reserved, and the occupied space is large.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an arc extinction device for an insulated junction of a steel rail of a vehicle section, which can realize bidirectional conduction, has a larger input voltage range, no time delay and quick response time, can quickly conduct the arc extinction device, and has small volume and no space occupation.
A vehicle section steel rail insulation knot arc extinction device comprises a first adjusting circuit, a second adjusting circuit, a self-oscillation trigger circuit, a third adjusting circuit, a fourth adjusting circuit, a bidirectional conduction loop and a switch S, wherein the self-oscillation trigger circuit comprises a comparison circuit and an NE555 timer; the +12V power supply outputs an adjustable reference voltage signal Vref through a first regulating circuit, bipolar voltage signals at two ends of a switch S output a unipolar direct current signal Vo through a second regulating circuit, the reference voltage signal Vref and the unipolar direct current signal Vo are input into a comparison circuit, the bipolar voltage signals are input into a pin 2 of an NE555 timer after being processed by the comparison circuit and then output through a pin 3 of the NE555 timer, the output signals are respectively input into a bidirectional conduction loop through a third regulating circuit and a fourth regulating circuit to trigger the bidirectional conduction loop to work, and the bidirectional conduction loop is connected with the switch S in parallel.
Preferably, the first regulating circuit comprises a resistor R4, an adjustable resistor PR1, a resistor R10, a controllable precision voltage regulator VR1 and a capacitor C4, one end of the resistor R4 is connected with a +12V power supply, the other end of the resistor R4 is connected with one end of the resistor R10 through an adjustable resistor PR1, the other end of the resistor R10 is grounded, the adjustable resistor PR1 is connected with a pin 2 of the controllable precision voltage regulator VR1 in an adjustable mode, a pin 1 of the controllable precision voltage regulator VR1 is connected with the resistor R4, a reference voltage signal Vref is output, a pin 3 is grounded, one end of the capacitor C4 is connected with a pin 1 of the controllable precision voltage regulator VR1, and the other end of the.
Preferably, the second regulating circuit comprises resistors R1, R2, R3, R5, R6, R7, R8, R9, a capacitor C3, diodes D1, D2, operational amplifiers U1A, U1B; one end of the resistor R5 is connected with a bipolar voltage signal, the other end of the resistor R6 is connected with the reverse input end of the operational amplifier U1A, the same-direction input end of the operational amplifier U1A is grounded through the resistor R8, the output end of the operational amplifier U1A is connected with the cathode of the diode D2, the anode of the diode D2 is connected with the reverse input end of the operational amplifier U1B through the resistor R7, the same-direction input end of the operational amplifier U1B is grounded through the resistor R9, and the output end of the operational amplifier U1B outputs a unipolar; resistors R1 and R2 are connected in series and then connected between the common end of the resistors R5 and R6 and the output end of the operational amplifier U1B, a resistor R3 is connected between the reverse input end of the operational amplifier U1A and the anode of a diode D2, the cathode of the diode D2 is connected with the anode of a diode D1, the cathode of the diode D1 is connected with the reverse input end of the operational amplifier U1A, and the reverse input end of the operational amplifier U1B is connected with the common end of the resistors R1 and R2; one end of the capacitor C3 is connected with the common end of the resistors R5 and R6, and the other end is grounded.
Preferably, the bidirectional conduction loop is composed of two thyristors VT1 and VT2 which are connected in parallel in an opposite direction.
Preferably, the comparison circuit is LM 393.
Preferably, the third regulating circuit includes resistors R16, R17, R20, R22, R24, an N-channel enhanced type insulated gate field effect transistor Q2, a low-frequency transformer T1, and a diode D3, one end of the resistor R24 is grounded, the other end of the resistor R24 is connected to one end of the resistor R22, the other end of the resistor R22 is connected to a host channel CNTL1, a common end of the resistor R24 and the resistor R22 is connected to a gate of the N-channel enhanced type insulated gate field effect transistor Q2, a drain of the N-channel enhanced type insulated gate field effect transistor Q2 is connected to one end of the resistor R20, the other end of the resistor R20 is connected to one end of the resistor R16 through a diode D3, the diode D3 is connected to two common ends of the resistor R16 in parallel to the low-frequency transformer T1, and two ends of the low-frequency transformer T1 are connected to a load resistor R17.
Preferably, the fourth regulating circuit includes resistors R19, R21, R25, R26, R27, an N-channel enhanced type insulated gate field effect transistor Q3, a low-frequency transformer T2, and a diode D4, one end of the resistor R27 is grounded, the other end of the resistor R27 is connected to one end of the resistor R26, the other end of the resistor R26 is connected to a host channel CNTL2, a common end of the resistor R27 and the resistor R26 is connected to a gate of the N-channel enhanced type insulated gate field effect transistor Q3, a drain of the N-channel enhanced type insulated gate field effect transistor Q3 is connected to one end of the resistor R25, the other end of the resistor R25 is connected to one end of the resistor R19 through a diode D4, the diode D4 is connected to two common ends of the resistor R19 in parallel to the low-frequency transformer T2, and two ends of the low-frequency transformer T1 are connected to a load resistor R17.
Compared with the prior art, the invention does not need an additional voltage detection device, realizes the quick trigger of the bidirectional conduction loop through the internal self-oscillation trigger circuit, shortens the reaction time of the arc extinction device and has lower misjudgment rate; the circuit adopts the positive and negative parallel connection of the controllable silicon, realizes the function of bidirectional conduction, and has larger input voltage range and better sensitivity effect; in addition, the trigger frequency of the self-oscillation trigger circuit is modified by changing the capacitance and the resistance value, so that the conduction mode of the silicon controlled rectifier is more flexible. The voltage detection circuit provided by the invention has the advantages that the volume is greatly reduced, the occupied space is small, hardware equipment is reduced, the fault rate of a system is reduced, the normal operation of the circuit is ensured, and the service life of the circuit is prolonged.
Drawings
FIG. 1 is a schematic block diagram of the power supply of the present invention;
FIG. 2 is a schematic diagram of a first regulating circuit of the present invention;
FIG. 3 is a schematic diagram of a second regulating circuit of the present invention;
FIG. 4 is a schematic diagram of the circuit for triggering the bidirectional conduction loop of the present invention;
fig. 5 is a schematic diagram of the self-oscillating trigger circuit of the present invention.
Fig. 6 is a schematic diagram of a third regulating circuit of the present invention.
Fig. 7 is a schematic diagram of a fourth regulating circuit of the present invention.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 1-7, the arc extinction device for the track insulation junction of the invention comprises a first regulating circuit, a second regulating circuit, a self-oscillation trigger circuit, a third regulating circuit, a fourth regulating circuit, a bidirectional conduction loop and a switch S, wherein as shown in fig. 5, the self-oscillation trigger circuit comprises a comparison circuit and an NE555 timer, the comparison circuit is an LM393, and the comparison circuit is an LM 393; the +12V power supply outputs an adjustable reference voltage signal Vref through a first regulating circuit, bipolar voltage signals at two ends of a switch S output a unipolar direct current signal Vo through a second regulating circuit, the reference voltage signal Vref and the unipolar direct current signal Vo are input into a comparison circuit, the bipolar voltage signals are input into a pin 2 of an NE555 timer after being processed by the comparison circuit and then output through a pin 3 of the NE555 timer, the output signals are input into a bidirectional conduction loop after being processed by a third regulating circuit and a fourth regulating circuit respectively, the bidirectional conduction loop is triggered to work, and the bidirectional conduction loop is connected with the switch S in parallel.
The first adjusting circuit comprises a resistor R4, an adjustable resistor PR1, a resistor R10, a controllable precise voltage-stabilizing source VR1 and a capacitor C4, one end of the resistor R4 is connected with a +12V power supply, the other end of the resistor R1 is connected with one end of a resistor R10, the other end of the resistor R10 is grounded, the adjustable resistor PR1 is connected with a pin 2 of the controllable precise voltage-stabilizing source VR1 in an adjustable mode, a pin 1 of the controllable precise voltage-stabilizing source VR1 is connected with a resistor R4, a reference voltage signal Vref is output at the same time, a pin 3 is grounded, one end of the capacitor C4 is connected with a pin 1 of the controllable precise voltage-stabilizing source VR 1.
The second regulating circuit comprises resistors R1, R2, R3, R5, R6, R7, R8 and R9, a capacitor C3, diodes D1 and D2, operational amplifiers U1A and U1B; one end of the resistor R5 is connected with a bipolar voltage signal, the other end of the resistor R6 is connected with the reverse input end of the operational amplifier U1A, the same-direction input end of the operational amplifier U1A is grounded through the resistor R8, the output end of the operational amplifier U1A is connected with the cathode of the diode D2, the anode of the diode D2 is connected with the reverse input end of the operational amplifier U1B through the resistor R7, the same-direction input end of the operational amplifier U1B is grounded through the resistor R9, and the output end of the operational amplifier U1B outputs a unipolar; resistors R1 and R2 are connected in series and then connected between the common end of the resistors R5 and R6 and the output end of the operational amplifier U1B, a resistor R3 is connected between the reverse input end of the operational amplifier U1A and the anode of a diode D2, the cathode of the diode D2 is connected with the anode of a diode D1, the cathode of the diode D1 is connected with the reverse input end of the operational amplifier U1A, and the reverse input end of the operational amplifier U1B is connected with the common end of the resistors R1 and R2; one end of the capacitor C3 is connected with the common end of the resistors R5 and R6, and the other end is grounded.
The bidirectional conductive loop consists of two silicon controlled rectifiers VT1 and VT2 which are connected in parallel in an opposite direction.
The third regulating circuit comprises resistors R16, R17, R20, R22, R24, an N-channel enhanced insulated gate field effect transistor Q2, a low-frequency transformer T1 and a diode D3, wherein one end of the resistor R24 is grounded, the other end of the resistor R24 is connected with one end of the resistor R22, the other end of the resistor R22 is connected with a host channel CNTL1, the common end of the resistor R24 and the resistor R22 is connected with the gate of the N-channel enhanced insulated gate field effect transistor Q2, the drain of the N-channel enhanced insulated gate field effect transistor Q2 is connected with one end of the resistor R20, the other end of the resistor R20 is connected with one end of the resistor R16 through a diode D3, the two common ends of the diode D3 and the resistor R16 are connected in parallel with a low-frequency transformer T1, and two ends of the low-frequency transformer T1 are connected with a load resistor R17.
The fourth regulating circuit comprises resistors R19, R21, R25, R26, R27, an N-channel enhanced insulated gate field effect transistor Q3, a low-frequency transformer T2 and a diode D4, wherein one end of the resistor R27 is grounded, the other end of the resistor R27 is connected with one end of the resistor R26, the other end of the resistor R26 is connected with a host channel CNTL2, the common end of the resistor R27 and the resistor R26 is connected with the gate of the N-channel enhanced insulated gate field effect transistor Q3, the drain of the N-channel enhanced insulated gate field effect transistor Q3 is connected with one end of the resistor R25, the other end of the resistor R25 is connected with one end of the resistor R19 through a diode D4, the two common ends of the diode D4 and the resistor R19 are connected in parallel with a low-frequency transformer T2, and two ends of the low-frequency transformer T1 are connected with a load resistor R17.
When the circuit works, the +12V voltage outputs an adjustable reference voltage signal Vref through the first regulating circuit, bipolar voltage signals at two ends of the switch S output unipolar direct current signals Vo through the second regulating circuit, the reference voltage signal Vref and the unipolar direct current signals Vo are connected to the input end of the comparison circuit, when the unipolar direct current signals Vo are larger than the reference voltage signal Vref, the comparison circuit outputs a high level, the output end of the comparison circuit is connected to the 2 pin of the NE555 timer, and the NE555 timer outputs a high level;
the output signal of the NE555 pulls the VO 'to the ground level through the transistor Q1, at the moment, the comparison circuit outputs the low level, the NE555 also outputs the low level, the transistor Q1 is not conducted, the VO' recovers to the VO amplitude, the comparison circuit and the NE555 continue to output the high level, and the transistor Q1 is 2N 7002. Because of the time delay circuit of the NE555 timer, the NE555 timer outputs a pulse signal with a stable period, and the output signal of the NE555 timer triggers the bidirectional conduction loop through the third regulating circuit and the fourth regulating circuit respectively, so that the rails on two sides of the insulating knot are discharged due to communication, and the rails are prevented from being ignited and burnt at the insulating knot.
Claims (7)
1. The arc extinction device for the rail insulation junction of the vehicle section is characterized by comprising a first adjusting circuit, a second adjusting circuit, a self-oscillation trigger circuit, a third adjusting circuit, a fourth adjusting circuit, a bidirectional conduction loop and a switch S, wherein the self-oscillation trigger circuit comprises a comparison circuit and an NE555 timer; the +12V power supply outputs an adjustable reference voltage signal Vref through a first regulating circuit, bipolar voltage signals at two ends of a switch S output a unipolar direct current signal Vo through a second regulating circuit, the reference voltage signal Vref and the unipolar direct current signal Vo are input into a comparison circuit, the bipolar voltage signals are input into a pin 2 of an NE555 timer after being processed by the comparison circuit and then output through a pin 3 of the NE555 timer, the output signals are respectively input into a bidirectional conduction loop through a third regulating circuit and a fourth regulating circuit to trigger the bidirectional conduction loop to work, and the bidirectional conduction loop is connected with the switch S in parallel.
2. A vehicle section steel rail insulated knot arc extinction device according to claim 1, wherein the first adjusting circuit comprises a resistor R4, an adjustable resistor PR1, a resistor R10, a controllable precise voltage-stabilizing source VR1 and a capacitor C4, one end of the resistor R4 is connected with a +12V power supply, the other end of the resistor R1 is connected with one end of a resistor R10, the other end of the resistor R10 is grounded, the adjustable resistor PR1 is connected with 2 pins of the controllable precise voltage-stabilizing source VR1 in an adjustable mode, 1 pin of the controllable precise voltage-stabilizing source VR1 is connected with a resistor R4, a reference voltage signal Vref is output, 3 pins are grounded, one end of the capacitor C4 is connected with 1 pin of the controllable precise voltage-stabilizing source VR1, and the other end of the capacitor C4 is grounded.
3. A vehicle section steel rail insulated junction arc extinction device according to claim 1, wherein the second adjusting circuit comprises resistors R1, R2, R3, R5, R6, R7, R8, R9, a capacitor C3, diodes D1 and D2, operational amplifiers U1A and U1B; one end of the resistor R5 is connected with a bipolar voltage signal, the other end of the resistor R6 is connected with the reverse input end of the operational amplifier U1A, the same-direction input end of the operational amplifier U1A is grounded through the resistor R8, the output end of the operational amplifier U1A is connected with the cathode of the diode D2, the anode of the diode D2 is connected with the reverse input end of the operational amplifier U1B through the resistor R7, the same-direction input end of the operational amplifier U1B is grounded through the resistor R9, and the output end of the operational amplifier U1B outputs a unipolar; resistors R1 and R2 are connected in series and then connected between the common end of the resistors R5 and R6 and the output end of the operational amplifier U1B, a resistor R3 is connected between the reverse input end of the operational amplifier U1A and the anode of a diode D2, the cathode of the diode D2 is connected with the anode of a diode D1, the cathode of the diode D1 is connected with the reverse input end of the operational amplifier U1A, and the reverse input end of the operational amplifier U1B is connected with the common end of the resistors R1 and R2; one end of the capacitor C3 is connected with the common end of the resistors R5 and R6, and the other end is grounded.
4. A vehicle section steel rail insulated junction arc extinction device according to claim 1, wherein the bidirectional conduction loop is composed of two silicon controlled rectifiers VT1, VT2 which are connected in parallel in an opposite direction.
5. A vehicle section rail insulated joint arc extinction device according to claim 1, wherein the comparison circuit is LM 393.
6. A vehicle section rail insulation tie arc extinction device according to claim 1, the third regulating circuit comprises resistors R16, R17, R20, R22, R24, an N-channel enhanced insulated gate field effect transistor Q2, a low-frequency transformer T1 and a diode D3, one end of the resistor R24 is grounded, the other end of the resistor R24 is connected with one end of the resistor R22, the other end of the resistor R22 is connected with a host channel CNTL1, the common end of the resistor R24 and the resistor R22 is connected with the grid electrode of an N-channel enhancement type insulated gate field effect transistor Q2, the drain of the N-channel enhancement type insulated gate field effect transistor Q2 is connected to one end of a resistor R20, the other end of the resistor R20 is connected with one end of a resistor R16 through a diode D3, two common ends of the diode D3 and the resistor R16 are connected with a low-frequency transformer T1 in parallel, and two ends of the low-frequency transformer T1 are connected with a load resistor R17.
7. A vehicle section rail insulation tie arc extinction device according to claim 1, the fourth regulating circuit comprises resistors R19, R21, R25, R26, R27, an N-channel enhanced insulated gate field effect transistor Q3, a low-frequency transformer T2 and a diode D4, one end of the resistor R27 is grounded, the other end of the resistor R27 is connected with one end of the resistor R26, the other end of the resistor R26 is connected with a host channel CNTL2, the common end of the resistor R27 and the resistor R26 is connected with the grid electrode of an N-channel enhancement type insulated gate field effect transistor Q3, the drain of the N-channel enhancement type insulated gate field effect transistor Q3 is connected to one end of a resistor R25, the other end of the resistor R25 is connected with one end of a resistor R19 through a diode D4, two common ends of the diode D4 and the resistor R19 are connected with a low-frequency transformer T2 in parallel, and two ends of the low-frequency transformer T1 are connected with a load resistor R17.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911034068.0A CN110745035A (en) | 2019-10-29 | 2019-10-29 | Arc extinguishing device for insulated joint of steel rail of vehicle section |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911034068.0A CN110745035A (en) | 2019-10-29 | 2019-10-29 | Arc extinguishing device for insulated joint of steel rail of vehicle section |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110745035A true CN110745035A (en) | 2020-02-04 |
Family
ID=69280605
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911034068.0A Pending CN110745035A (en) | 2019-10-29 | 2019-10-29 | Arc extinguishing device for insulated joint of steel rail of vehicle section |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110745035A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0313542A2 (en) * | 1987-10-21 | 1989-04-26 | GEC ALSTHOM T&D GESELLSCHAFT m.b.H. | Device for the controlled switching of inductive elements in a high-voltage network |
| US20130105444A1 (en) * | 2011-11-01 | 2013-05-02 | Richard Donald Prohaska | Arc Extinction Apparatus and DC Switch Apparatus |
| CN208707306U (en) * | 2018-09-28 | 2019-04-05 | 徐州润泽电气有限公司 | Track insulation knot arc-extinction device |
-
2019
- 2019-10-29 CN CN201911034068.0A patent/CN110745035A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0313542A2 (en) * | 1987-10-21 | 1989-04-26 | GEC ALSTHOM T&D GESELLSCHAFT m.b.H. | Device for the controlled switching of inductive elements in a high-voltage network |
| US20130105444A1 (en) * | 2011-11-01 | 2013-05-02 | Richard Donald Prohaska | Arc Extinction Apparatus and DC Switch Apparatus |
| CN208707306U (en) * | 2018-09-28 | 2019-04-05 | 徐州润泽电气有限公司 | Track insulation knot arc-extinction device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| USRE41766E1 (en) | Self-driven synchronous rectified boost converter with inrush current protection using bidirectional normally on device | |
| WO2019169904A1 (en) | Low-cost input anti-overvoltage protection circuit | |
| WO2018076794A1 (en) | Redundant backup control circuit of battery management system | |
| CN108964434B (en) | Power-down delay protection circuit for switching power supply | |
| CN105514929A (en) | Self-power direct current solid state circuit breaker based on normal open type SiC device | |
| CN108134514B (en) | Discharge protection circuit of power MOS tube in inverter circuit | |
| CN105811369A (en) | Bypass protection device for high-voltage DC circuit breaker and protection method thereof | |
| CN108879591A (en) | High current power supply protection circuit | |
| CN109962462B (en) | Direct current electric wire netting two-way current blocking circuit based on series switch | |
| CN105552828A (en) | Self-powered bidirectional direct-current solid-state circuitbreaker | |
| CN110745035A (en) | Arc extinguishing device for insulated joint of steel rail of vehicle section | |
| CN202217996U (en) | Vehicle-mounted power supply unloading transient pulse inhibitor | |
| CN210898523U (en) | Airborne anti-surge active clamping protection circuit | |
| CN208707306U (en) | Track insulation knot arc-extinction device | |
| CN203193500U (en) | Switching power supply and charging loop thereof | |
| CN202564933U (en) | Power supply device | |
| US20230238795A1 (en) | Brct clamping absorption circuit with short circuit protection | |
| CN208707290U (en) | A kind of IGBT current foldback circuit and air conditioner | |
| CN217406186U (en) | Delay conduction circuit for inhibiting startup peak current at negative terminal | |
| CN206820646U (en) | RCD absorbing circuits and switching power circuit | |
| CN206293877U (en) | A kind of overvoltage crowbar | |
| CN203014679U (en) | Improved fault safe DC-DC power supply equipment | |
| CN211127124U (en) | Surge current suppression circuit | |
| CN215580366U (en) | Stray current and rail potential comprehensive limiting circuit | |
| CN112349545B (en) | Direct current switch |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200204 |